Carriage-return for type-writers



No. 749,723. x PATENTED JAN. 19, 1904.

D.S.DUFUR.

N0 MODEL.

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UNITED STATES Patented January 19, 1904.

DOUGLAS S. DUFUR, OF THE DALLES, OREGON.

CARRIAGE-RETURN FOR TYPE-WRITERS.

SPECIFICATION forming part of Letters Patent No. 749,723, dated January 19, 1904.

Application filed February 28, 1903. Serial No. 145,607. (No model.)

To all whom it may concern.-

Be it known that I, DOUGLAS S. DUFUR, a citizen of the United States, residing at The Dalles, in the county of Wasco and State of Oregon, have invented certain new and useful Improvements in Carriage-Returns for Type- Writers; and I do herebydeclare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The object of my invention is to provide pneumatically-operated means for actuating a reciprocatory member, and especially for returning a type-writer carriage to its initial position.

A further object of my invention contemplates means for returning a type-writer carriage to its initial position and rotating its supported platen for line-spacing.

With these objects in view and others my invention consists in the constructions, arrangements, and combinations of parts hereinafter described and claimed.

In the drawings forming a part of this application, and in which similar reference-letters indicate corresponding parts in the several views, Figure 1 is a perspective view of my invention applied to atype-writer. Fig. 2 is a section of the compression-cylinder, on an enlarged scale. Fig. 3 isa'plan view of the platen-rotating device, on an enlarged scale. Fig. 4 is adetail ofthe latter mechanism, and Fig. 5 is a sectional view of the carriage-actuating cylinder and piston.

WhileI have shown my invention as applied to a type-writer of the Densmore type supported on the usual stand, the invention is applicable to other forms of type-writers and may be attached to any form of table, desk, or cabinet.

This invention may also be applied to any kindred apparatus, such as a linotype-machine, wherein there is a reciprocable member that is moved in one direction by the operation of keys.

Referring to the drawings more in detail, A indicates a suitable stand provided with the legs aa. B indicates a type-writing machine,

which is here shown conventionally with the keyboard and certain details omitted for greater clearness. The type-Writer frame B is shown supporting the usual carriage O, which carries the rotatable platen D. A pneumatic cylinder F, provided with a piston G and piston-rod G is suitably supported on one of the legs a, and a guide A is preferably provided forthe outer end of the said piston-rod. A swing-arm E is pivoted at c to the stand and is provided at its lower end with a stirrup E conveniently located for actuation by the operators foot. The swing-arm is operatively connected to the piston-rod G by a link E pivotally connected to said swingarm and to a pin E, secured to the piston-rod. The front end of cylinder F is provided with a head F having air-passages F,formed therein, and the rear end of said cylinder carries a head F provided with an apertured boss F, The piston G is slidably mounted between two abutments G G on the piston-rod, and said rod is provided at its extremity with a bore G arranged in communication with radial apertures G The bore G is so proportioned that when the piston-rod is moved forward with the piston engaging the abutment G no communication will exist between the two ends of the cylinder F, and when the pistonrod is moved back with the piston engaging the abutment G free communication between the two ends of the cylinder F will be permitted through the bore G and its communicating apertures G. The piston G will be frictionally held in the cylinder by its usual packing g until engaged by one of the abutments G 01 G. A second cylinder H, supported upon standards h 72. on the stand A, is provided with a piston 1 and piston-rod H the piston-rod having a bent portion H. A head H, provided with air-passages H is secured to one end of the cylinder, and the other end of the cylinder carries a head H having an apertured boss H. A weight R is shown attached to a cord R which is guided by a pulley R and secured to a pin R on the piston-rod-H This weight is designed to overcome the frictional resistance of the piston H in its cylinder during the movement of the type-writer platen while the operator is writing. A suitable pipe I, secured to the bosses H and F, affords communication between the cylinders F and H, as shown. A shaft M is mounted in a support d journaled on the end of the platen-shaft (Z and in a bracket 0Z secured to the type-writer carriage C.

Slidably mounted in a cross-arm J. 3 on the shaft NI is a pawl 1V1, which is held in engagement with a crown-gear K on the platen-shaft by a spring M. A pin M limits the travel of the ratchet M The shaft M carries a crank N, which is connected to the bent portion H of piston-rod H by a spring-bar P. The spring P acts to prevent the transmission of shocks or vibrations from the pistonrod H to the type-writer carriage. The shaft M is provided with a joint M intermediate its supports to permit the type-writer platen being raised from its carriage.

hen the shaft M is rocked by the arm N, secured to its free extremity, the ratchet M will engage the crown-gear K, and thereby rotate the platen a distance regulated by means of a pin 0, secured on the shaft M,

whichengages a three-armed stop 0 adjustably mounted on the carriage C and provided with arms of graduated length. hen the disk is turned so that the longest arm 0 will be engaged by the pin 0, the ratchet will move the crown-gear the distance of one tooth. When the arm 0 is arranged to engage the pin 0, the ratchet will move the crown-gear the distance of two teeth. When the shortest arm 0 of the disk is engaged by the stop-pin O, the ratchet can move the crown-gear the distance of three teeth.

The operation of the above parts is as follows: The foot-lever E is moved forward to advance the piston-rod G After a line has been written or it is desired to return the carriage and platen the operator moves the footlever forward, which through the link connecting rod IE will cause the piston-r0d and piston G to be advanced. This movement of the piston drives the air contained in cylinder F out through the pipe I and into the cylinder H, thereby advancing the piston H and its rod H' and rocking the shaft M. The shaft M in rocking will rotate the platen D until its pin 0 engages the stop 0 Thereupon the continued movement of the piston-rod H will draw the carriage C along to the limit of its movement. The cylinder H is so proportioned that its piston will not have advanced the full length of the cylinder when the carriage reaches the end of its travel. Therefore the further movement or pressure by the foot after the carriage has been returned will act to further compress the air in the cylinder H,'

the piston-rod H and piston H, which latter movement will force the air back of the piston H through the pipe I and into the cylinder F, where it will escape through ports G Gr and apertures F. The next advanced movement of the arm E and piston-rod G will cause the piston-rod to move through the piston Gr until said piston is again in engagement with the abutment G when the action of the several parts will be as hereinbefore described.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is i 1. In a typewriting machine having the usual carriage, the combination of a cylinder, a piston in said cylinder and arranged to return the type-writer carriage to position forbeginning a line of typewriting, a second cylinder arranged in communication with the first cylinder, a piston in said second cylinder, and arranged to, upon its advance movement, actuate the first piston and return the type-writer car' riage, and constructed to be moved rearwardly without affecting the pressure in said first cylinder arranged in communication with the first cylinder, a piston in said second cylinder, and arranged to, upon its advance movement, actuate the first piston and return the typewriter carriage, and constructed to be moved rearwardly without affecting the pressure in said first cylinder, means constructed to permit the piston in said first cylinder to be returned without affecting the pressure in its cylinder, and means, under the control of the operator, arranged to advance and retract said second plston, substantially as described.

3. In a typewriting machine having the usual carriage, the combination of a cylinder,

a piston in said cylinder and arranged to return the type-writer carriage to position for beginning a line of type-writing, a second cylinder arranged in communication with the first cylinder, a piston in said second cylinder, and arranged to, upon its advance movement, actuate the first piston and return the typewriter carriage, a valve device constructed and arranged to permit the return of said sec- IIO ond piston in its cylinder without affecting the pressure in the first cylinder, and means, under the control of the operator, arranged to advance and retract said second piston, substantially as described.

4. In a type-writing machine having the usual carriage, the combination of a cylinder, a piston in said cylinder and arranged to return the type-writer carriage to position for beginning a line of type-writing, a second cylinder arranged in communication with the first cylinder, a piston in said second cylinder, and arranged to, upon its advance movement, actuate the first piston and return the typewriter carriage, avalve device constructed and arranged to permit the return of said second piston in its cylinder without affecting the pressure in the first cylinder, means constructed to permit the piston in said first cylinder to be returned without affecting the pressure in its cylinder, and means, under the control of the operator, arranged to advance and retract said second piston, substantially as described.

5. In a type-writing machine having the usual carriage, the combination of pneumatic ally-actuated means arranged to return the type-writer carriage to position for beginning a line of type-writing, a pneumatic cylinder arranged in communication with said pneumatically-actuated means, a piston-rod carrying two abutments and providedwith a bore-opening adjacent said abutments, a piston in said cylinder slidably mounted on the piston-rod between said abutments, and means arranged to operate said piston-rod and piston, substantially as described.

6. In a type-writing machine having the usual carriage, the combination of a cylinder and its piston, means arranged to connect said piston to the type-writer carriage, said means including a spring-bar, a second cylinder arranged in communication with the first cylinder, a piston in the second cylinder, and means arranged. to operatesaid second piston, substantially as described.

7 In a device of the character described, the combination with a reciprocable member movable in one direction by the writing mechanism, of a cylinder, a piston movable in the cylinder and arranged to move said member in the opposite direction, a second cylinder having an axial aperture, a piston in said latter cylinder, a piston-rod in said latter cylinder passing through said apertured portion of the piston, two abutments on said piston-rod, one arranged on each side of said piston, said piston-rod having an axial aperture and radial apertures from said aperture arranged between said abutments, a pipe affording communication between the said cylinders, and means for operating the piston-rod in said second cylinder by the leg of the operator, substantially as described.

8. In a type-writing machine having the usual carriage and platen, the combination of a cylinder, its piston and piston-rod, atoothed wheel arranged to be secured to the typewriter platen, a shaft carrying a pawl in engagement with said toothed wheel, a crank secured on said shaft, aspring-bar connecting saidcrank and piston-rod, a second cylinder in communication with the first cylinder, a

piston in said second cylinder, and means arranged to operate said second piston, substantially as described.

9. In a type-writing machine having the usual carriage and platen, the combination of l In testimony whereof I afiix my signature in the presence of two subscribing witnesses.

DOUGLAS S. DUFUR.

Witnessesi CHAS. F. MICHELBACH, WM. H. REID. 

